i dont know why but whenever i heard someone mention fret filing i always thought it meant fretboard filing. However, it just means filing the actual frets right ? I also hear people saying that this is a job for techs, but whats so hard about it ? and what do you use to file them ? Im asking because (semi long story ahead) ... I was intonating my guitar the other day and everything was going fine until i got to my g string. The fretted note was to sharp compared to the harmonic note and the saddle was as far back as it could go. Well, i solved the problem by lowering my bridge a bit on the high e side, but my high e string doesnt has string buzz when played on the 20th or 19th fret (because its hitting the fret in front of it). Now, could i just file this fret down with no worrires, or is it something that shouldn't be done ? im really new to this, so any help would be greatly appreciated.